Eric Holt describes the Laguna Street shooting thatÍs hospitalized his niece Linda Ngo age 11 with a bullet wound to the chest. San Francisco Police have arrested one 18-year- and one 19-year-old men in connection with the shooting.

SAN FRANCISCO -- An 11-year-old girl who was nearly killed by a stray bullet during a sleepover in the Western Addition was improving Sunday, as San Francisco police investigated a spurt of gun violence across the city that wounded four others.

Linda Ngo was visiting a cousin Friday when a bullet blasted through the apartment's street-level window and struck her just above her heart. She had been kneeling on a bed waiting for her uncle to bring a late-night snack, while a street fight erupted into gunfire outside.

"She is OK today. She's still in the hospital, but she is doing better," said Linda's mother, Buu Buu Vuu. "I think she will be OK."

Police officials said they expected to release the names of two teenagers today who were arrested in connection with the shooting, which occurred about 11:15 p.m. at a public housing complex on Laguna Street near Jefferson Square Park.

Meanwhile, police were investigating three other shootings early Sunday that left four people hospitalized, one with critical injuries.

Just after midnight, a 59-year-old man walking on the 900 block of Anza Street, near the University of San Francisco's Lone Mountain campus, was shot in the hand, police said. He drove himself to the hospital.

"He heard a single pop and saw he was hit," Esparza said.

Then about 1:15 a.m., a shooting wounded two men on a Muni bus in Visitacion Valley, a block from McLaren Park. Bullets struck the men in the neck and hand, Esparza said, and they are expected to survive.

The suspect was not a bus rider, and investigators were looking into whether he fired through a window or stepped into the bus briefly while it was stopped.

More than an hour later, at 2:30 a.m., a 21-year-old woman was shot in the back as she stood with friends outside a house party at 25th and Folsom streets in the Mission District.

A friend drove her to San Francisco General - just a few blocks away - where she was being treated for life-threatening injuries, Esparza said.

Neighbors on the residential block said they were jolted awake by the gunshots.

"It was three very loud shots - boom, boom, boom. I started to look out the window but then thought better of it," said neighbor Wayne Morell.

Norman Collins, a 29-year resident of the block, said high-profile police crackdowns on gang activity in the area in recent years had cut violence.

"Guys dressed in the same colors used to congregate in front of certain stores, but police stop them from doing that now," he said. "They've cleaned it up. But you can't stop all of it, I guess."

Police ask that anyone with information about the shootings call the department's anonymous tip line at (415) 575-4444.